public UITargetedDragPreview GetPreviewForLiftingItem(UIDragInteraction interaction, UIDragItem item, IUIDragSession session)
{
var image = item.LocalObject as UIImage;
if (image == null)
{
return(null);
}
CGRect frame;
if (image.Size.Width > image.Size.Height)
{
var multiplier = ImageView.Frame.Width / image.Size.Width;
frame = new CGRect(0, 0, ImageView.Frame.Width, ImageView.Frame.Height * multiplier);
}
else
{
var multiplier = ImageView.Frame.Height / image.Size.Height;
frame = new CGRect(0, 0, ImageView.Frame.Width * multiplier, ImageView.Frame.Height);
}
var previewImageView = new UIImageView(image)
{
ContentMode = UIViewContentMode.ScaleAspectFit,
Frame = frame
};
var target = new UIDragPreviewTarget(ImageView, ImageView.Center);
return(new UITargetedDragPreview(previewImageView, new UIDragPreviewParameters(), target));
}
public UITargetedDragPreview GetPreviewForLiftingItem(UIDragInteraction interaction, UIDragItem item, IUIDragSession session)
{
var imageView = new UIImageView(Image)
{
Frame = this.Frame,
ClipsToBounds = true,
ContentMode = UIViewContentMode.ScaleAspectFill
};
var target = new UIDragPreviewTarget(Superview, imageView.Center);
return(new UITargetedDragPreview(imageView, new UIDragPreviewParameters(), target));
}
public UITargetedDragPreview GetPreviewForDroppingItem(UIDropInteraction interaction, UIDragItem item, UITargetedDragPreview defaultPreview)
{
if (item.LocalObject == null)
{
return(null);
}
else
{
DropPoint = defaultPreview.View.Center;
var target = new UIDragPreviewTarget(View, DropPoint); // HACK: why is this null?
//return defaultPreview.GetRetargetedPreview(target);
return(defaultPreview);
}
}
private UITargetedDragPreview DragPreviewForItem(UIDragItem item)
{
var qrCode = item.LocalObject as QRDetectionResult;
if (qrCode == null)
{
return(new UITargetedDragPreview(this));
}
var previewView = new UIImageView(qrCode.CroppedImage);
previewView.Frame = ConvertRectToView(this.ConvertFromImageRect(qrCode.RectInOriginalImage), Window);
var target = new UIDragPreviewTarget(Window, previewView.Center);
var parameters = new UIDragPreviewParameters()
{
VisiblePath = UIBezierPath.FromRoundedRect(previewView.Bounds, 20f)
};
return(new UITargetedDragPreview(previewView, parameters, target));
}
public UITargetedDragPreview GetPreviewForDroppingItem(UIDropInteraction interaction, UIDragItem item, UITargetedDragPreview defaultPreview)
{
var target = new UIDragPreviewTarget(this, IconView.Center, CGAffineTransform.Scale(new CGAffineTransform(), 0.1f, 0.1f));
return(defaultPreview.GetRetargetedPreview(target));
}
